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content/en/docs/reference/glossary/customresourcedefinition.md

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+---
+title: CustomResourceDefinition
+id: CustomResourceDefinition
+date: 2018-04-12
+full_link: docs/tasks/access-kubernetes-api/extend-api-custom-resource-definitions/
+short_description: >
+  Custom code that defines a resource to add to your Kubernetes API server without building a complete custom server.
+
+aka: 
+tags:
+- fundamental
+- operation
+- extension
+---
+ Custom code that defines a resource to add to your Kubernetes API server without building a complete custom server.
+
+<!--more--> 
+
+Custom Resource Definitions let you extend the Kubernetes API for your environment if the publicly supported API resources can't meet your needs. 
+